Is there even some bootloader installed?
Maybe you first backup the contents of the MCUs flash and then try to install some different bootloader.
For example USBaspLoader (https://github.com/baerwolf/USBaspLoader) works with avrdude (therefore Arduino, too).
So with USBaspLoader you can eliminate the need for some extra software. The driver needed for USBaspLoader under Windows is the same as the driver for USBasp itself (surprise!). You can downloat this driver at: http://www.fischl.de/usbasp/
Best regards
Maybe you first backup the contents of the MCUs flash and then try to install some different bootloader.
For example USBaspLoader (https://github.com/baerwolf/USBaspLoader) works with avrdude (therefore Arduino, too).
So with USBaspLoader you can eliminate the need for some extra software. The driver needed for USBaspLoader under Windows is the same as the driver for USBasp itself (surprise!). You can downloat this driver at: http://www.fischl.de/usbasp/
Best regards